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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): September 16, 2024

PASSAGE BIO, INC.

(Exact name of registrant as specified in its charter)

Delaware

001-39231

82-2729751

(State or other jurisdiction
of incorporation)

(Commission
File Number)

(IRS Employer
Identification No.)

One Commerce Square
2005 Market Street, 39th Floor
Philadelphia, PA

19103

(Address of principal executive offices)

(Zip Code)

(267) 866-0311

(Registrant’s telephone number, including area code)

N/A

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading symbol(s)

Name of each exchange on which registered

Common Stock, $0.0001 Par Value Per Share

PASG

The Nasdaq Stock Market LLC
(Nasdaq Global Select Market)

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

Item 7.01 Regulation FD Disclosure.

On September 16, 2024, Passage Bio Inc. (the “Company”) issued a press release and updated its corporate presentation related to its poster presentation at the 14th International Conference on Frontotemporal Dementias (the “ISFTD2024 Poster”). A copy of the press release, corporate presentation, and ISFTD2024 Poster are attached as Exhibits 99.1, 99.2 and 99.3, respectively, to this Current Report on Form 8-K.

The information in this Item 7.01, including Exhibits 99.1, 99.2 and 99.3 to this Current Report on Form 8-K, shall not be deemed to be “filed” for purposes of Section 18 of the Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended (the “Securities Act”) The information contained in this Item 7.01 and in the accompanying Exhibits 99.1, 99.2 and 99.3 shall not be incorporated by reference into any other filing under the Exchange Act or under the Securities Act, except as shall be expressly set forth by specific reference in such filing.

Item 8.01 Other Events.

PBFT02 Program Updates

On September 16, 2024, the Company announced updated interim safety and biomarker data from Cohort 1 patients who received Dose 1 of PBFT02 from the Company’s ongoing global Phase 1/2 clinical trial, upliFT-D, evaluating PBFT02, an adeno-associated virus-delivery gene therapy for the treatment of patients aged 35 to 75 years with frontotemporal dementia caused by progranulin deficiency, or FTD-GRN.  

PBFT02 was well-tolerated in all patients (patients 2, 3, 4 and 5) who received an enhanced immunosuppression regimen following protocol amendment, as of August 20, 2024.
PBFT02 resulted in increased progranulin (“PGRN”) levels in the cerebral spinal fluid (CSF) in all patients, relative to baseline, with up to a 6-fold increase at one month (range of 10.7 to 17.3 ng/mL; n=5) and up to a 10-fold increase at six months (range of 21.7 to 27.3 ng/mL; n=2).
The effect of PBFT02 was consistent across all patients, with CSF PGRN levels exceeding the range found in healthy adult controls of 3.3 to 8.2 ng/mL (n=61).
CSF PGRN remained elevated at 12 months (n=1), reaching a level of 34.2 ng/mL. The rate of increase was 58% between one month and six months and slowed to 26% between six months and twelve months.
Plasma PGRN expression remained below healthy reference levels across all patients.

Item 9.01 Financial Statements and Exhibits.

(d)Exhibits

Exhibit No.

Description

99.1

Passage Bio, Inc. press release dated September 16, 2024

99.2

Corporate Presentation

99.3

ISFTD2024 Poster

104

Cover Page Interactive Data File (formatted as Inline XBRL).

2

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

PASSAGE BIO, INC.

Date: September 16, 2024

By:

/s/ Kathleen Borthwick

Kathleen Borthwick

Chief Financial Officer

3

Ex 99.1

Passage Bio to Present Positive Interim Data from Cohort 1 Patients with FTD-GRN in upliFT-D Study at 14th International Conference on Frontotemporal Dementias (ISFTD2024)

Interim safety and biomarker data from the upliFT-D trial in FTD-GRN demonstrated that Dose 1 of PBFT02 achieved robust levels of CSF progranulin in all treated Cohort 1 patients; elevated CSF progranulin levels were sustained up to 12 months post-treatment

Dose 1 of PBFT02 continued to be well-tolerated in all patients who received a revised immunosuppression regimen

Company to deliver the updated data during a poster presentation at ISFTD2024 on Friday, September 20, 2024 at 9:38 a.m. GMT

PHILADELPHIA, September 16, 2024 — Passage Bio, Inc. (Nasdaq: PASG), a clinical stage genetic medicines company focused on improving the lives of patients with neurodegenerative diseases, will present updated data from the ongoing global Phase 1/2 upliFT-D clinical trial evaluating PBFT02, an adeno-associated virus (AAV)-delivery gene therapy for the treatment of patients with frontotemporal dementia (FTD) with granulin (GRN) mutations, at the 14th International Conference on Frontotemporal Dementias (ISFTD2024). The poster presentation will include safety and biomarker data from all treated patients (n=5) in the first cohort of the study.

Juan Chavez, M.D., vice president of clinical development, will share the data during an oral presentation, Interim Safety and Biomarker Data From upliFT-D Trial of PBFT02 in FTD with GRN Mutations, on Friday, September 20, 2024 at 9:38 a.m. GMT.

"We are very encouraged by the positive Cohort 1 data from our upliFT-D trial demonstrating that intra-cisterna magna delivery of Dose 1 of PBFT02 resulted in robust and durable increases in CSF PRGN expression, with elevated levels maintained for up to one year after treatment,” said Will Chou, M.D., president and chief executive officer of Passage Bio. "Furthermore, PBFT02 continued to be well-tolerated among all Cohort 1 patients who received enhanced immunosuppression, with no serious adverse events or evidence of clinically significant immune responses observed in these patients. These results underscore the potential of PBFT02 as a best-in-class progranulin-raising therapy and further solidify our strategy to advance this one-time treatment in additional neurodegenerative diseases. We look forward to showcasing these findings during our poster session, and are thankful for the participants, their caregivers, and clinical trial investigators for their support of this study.”


Interim results from Cohort 1 (n=5) in the upliFT-D clinical trial

Safety (patient follow-up to 12 months)

Dose 1 of PBFT02 was well-tolerated in all patients (patients 2, 3, 4, and 5) who received an enhanced immunosuppression regimen following protocol amendment.
oNo serious adverse events (SAEs).
oAll treatment emergent adverse events (AEs) were mild to moderate in severity.
oNo evidence of clinically significant immune response, hepatotoxicity or safety related imaging abnormalities.
Patient 1 received a low level of immunosuppression (60 mg oral prednisone for 60 days) and experienced two SAEs that were both asymptomatic and consistent with an immune response.
oFollowing patient 1, the protocol was amended to increase the steroid regimen (1,000 mg IV methylprednisolone on days 1-3 followed by 60 mg oral prednisone through day 60) for all subsequent patients.
No evidence of dorsal root ganglion (DRG) toxicity, as measured by nerve conduction studies, and no complications during ICM administration were observed across any of the five patients.

Biomarkers

Dose 1 of PBFT02 treatment resulted in a robust and durable increase in PGRN expression.
Relative to baseline, PBFT02 increased CSF PGRN expression in all patients; up to 6-fold at one month (range of 10.7 to 17.3 ng/mL; n=5) and up to 10-fold at six months (range of 21.7 to 27.3 ng/mL; n=2).
The effect of PBFT02 was consistent across all patients, with CSF PGRN levels exceeding the range found in healthy adult controls of 3.3 to 8.2 ng/mL (n=61).
CSF PGRN remained elevated at 12 months (n=1), reaching a level of 34.2 ng/mL. The rate of increase slowed between six months and 12 months (one month to six months: 58% vs. six months to 12 months: 26%).
Plasma PGRN expression remained below healthy reference levels across all patients.

A copy of the poster presentation will be available on the Investor Events and Presentations page of the Passage Bio corporate website.


About upliFT-D (NCT04747431)

upliFT-D is a Phase 1/2 global, multi-center, open-label, dose-escalation clinical trial of PBFT02 administered by single injection into the cisterna magna in patients aged 35 to 75 years with FTD-GRN. The clinical trial will sequentially enroll two cohorts, with an optional third cohort expected to be enrolled based on the results of the first two cohorts. Enrollment is currently ongoing. The primary endpoint of the clinical trial is to evaluate the safety and tolerability of PBFT02. Secondary endpoints include disease biomarkers and clinical outcome measures. upliFT-D is a two-year clinical trial with a three-year safety extension. 

Passage Bio is pursuing several initiatives to support clinical trial recruitment and enrollment, including a collaborative partnership with InformedDNA to provide no-cost genetic counseling and testing for adults who have been diagnosed by their physicians with FTD. More information about upliFT-D can be found here.

About PBFT02

PBFT02 utilizes an AAV1 viral vector to deliver, through ICM administration, a functional GRN gene that encodes for PGRN. This vector construct and delivery approach aim to elevate PGRN levels in the central nervous system to alter the course of neurodegenerative diseases. Interim clinical data from the upliFT-D Phase 1/2 study in FTD-GRN participants shows that ICM administration of PBFT02 resulted in robust PGRN elevations in the CSF.

The potential clinical benefit of PBFT02 is supported by extensive preclinical studies. In non-human primates, a single ICM administration of PBFT02 led to broad vector distribution throughout the CNS, and robust, dose-dependent elevations in PGRN levels in CSF. An NHP study also demonstrated that AAV1 was particularly proficient at transducing ependymal cells. In a murine FTD model, PBFT02 administration improved lysosomal function and reduced neuroinflammation.

About Passage Bio

Passage Bio (Nasdaq: PASG) is a clinical stage genetic medicines company on a mission to improve the lives of patients with neurodegenerative diseases. Our primary focus is the development and advancement of cutting-edge, one-time therapies designed to target the underlying pathology of these conditions. Passage Bio’s lead product candidate, PBFT02, seeks to treat neurodegenerative conditions, including frontotemporal dementia, by elevating progranulin levels to restore lysosomal function and slow disease progression.

To learn more about Passage Bio and our steadfast commitment to protecting patients and families against loss in neurodegenerative conditions, please visit: www.passagebio.com.


Forward-Looking Statements

This press release contains “forward-looking statements” within the meaning of, and made pursuant to the safe harbor provisions of, the Private Securities Litigation Reform Act of 1995, including, but not limited to: our expectations about timing and execution of anticipated milestones, including the progress of clinical studies and the availability of clinical data from such trials; our expectations about our collaborators’ and partners’ ability to execute key initiatives; and the ability of our product candidates to treat their respective target CNS disorders. These forward-looking statements may be accompanied by such words as “aim,” “anticipate,” “believe,” “could,” “estimate,” “expect,” “forecast,” “goal,” “intend,” “may,” “might,” “plan,” “potential,” “possible,” “will,” “would,” and other words and terms of similar meaning. These statements involve risks and uncertainties that could cause actual results to differ materially from those reflected in such statements, including: our ability to develop and obtain regulatory approval for our product candidates; the timing and results of preclinical studies and clinical trials; risks associated with clinical trials, including our ability to adequately manage clinical activities, unexpected concerns that may arise from additional data or analysis obtained during clinical trials, regulatory authorities may require additional information or further studies, or may fail to approve or may delay approval of our drug candidates; the occurrence of adverse safety events; the risk that positive results in a preclinical study or clinical trial may not be replicated in subsequent trials or success in early stage clinical trials may not be predictive of results in later stage clinical trials; failure to protect and enforce our intellectual property, and other proprietary rights; our dependence on collaborators and other third parties for the development and manufacture of product candidates and other aspects of our business, which are outside of our full control; risks associated with current and potential delays, work stoppages, or supply chain disruptions; and the other risks and uncertainties that are described in the Risk Factors section in documents the company files from time to time with the Securities and Exchange Commission (SEC), and other reports as filed with the SEC. Passage Bio undertakes no obligation to publicly update any forward-looking statement, whether written or oral, that may be made from time to time, whether as a result of new information, future developments or otherwise.

For further information, please contact:

Investors:

Stuart Henderson

Passage Bio

267.866.0114

shenderson@passagebio.com

Media:

Mike Beyer
Sam Brown Inc. Healthcare Communications
312.961.2502
MikeBeyer@sambrown.com  


Exhibit 99.2

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Nasdaq: PASG © 2024 Passage Bio. All rights reserved. Corporate Presentation September 2024

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2 Forward-Looking Statement This presentation includes “forward-looking statements” within the meaning of, and made pursuant to the safe harbor provisions of, the Private Securities Litigation Reform Act of 1995, including, but not limited to: our expectations about timing and execution of anticipated milestones, including the initiation of dosing of FTD-C9orf72 patients, feedback from regulatory of authorities, the progress of clinical studies and the availability of clinical data from such trials; our expectations about our collaborators’ and partners’ ability to execute key initiatives; our ability to receive milestone payments from our partners; our expectations about cash runway; and the ability of our product candidates to treat their respective target CNS disorders. These forward-looking statements may be accompanied by such words as “aim,” “anticipate,” “believe,” “could,” “estimate,” “expect,” “forecast,” “goal,” “intend,” “may,” “might,” “plan,” “potential,” “possible,” “will,” “would,” and other words and terms of similar meaning. These statements involve risks and uncertainties that could cause actual results to differ materially from those reflected in such statements, including: our ability to develop and obtain regulatory approval for our product candidates; the timing and results of preclinical studies and clinical trials; risks associated with clinical trials, including our ability to adequately manage clinical activities, unexpected concerns that may arise from additional data or analysis obtained during clinical trials, regulatory authorities may require additional information or further studies, or may fail to approve or may delay approval of our drug candidates; the occurrence of adverse safety events; the risk that positive results in a preclinical study or clinical trial may not be replicated in subsequent trials or success in early stage clinical trials may not be predictive of results in later stage clinical trials; failure to protect and enforce our intellectual property, and other proprietary rights; our dependence on collaborators and other third parties for the development and manufacture of product candidates and other aspects of our business, which are outside of our full control; risks associated with current and potential delays, work stoppages, or supply chain disruptions; and the other risks and uncertainties that are described in the Risk Factors section in documents the company files from time to time with the Securities and Exchange Commission (SEC), and other reports as filed with the SEC. Passage Bio undertakes no obligation to publicly update any forward-looking statement, whether written or oral, that may be made from time to time, whether as a result of new information, future developments or otherwise.

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3 REDEFINING THE COURSE OF NEURODEGENERATIVE CONDITIONS Advancing potential best-in-class, one-time progranulin raising FTD-GRN gene therapy In-house manufacturing process development to support program execution Strong cash position with runway expected to the end of 2Q 2026* Exploring benefits of elevated progranulin in multiple adult neurodegenerative diseases * Based on cash, cash equivalents and marketable securities as of June 30, 2024 and initial proceeds from out-licensing of pediatric programs.

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4 Validating the Therapeutic Potential of PBFT02 Promising data from initial clinical study of PBFT02 in FTD-GRN Genetic form of FTD caused by GRN mutations, which lead to progranulin (PGRN) deficiency No approved disease-modifying therapies One-time therapy Proprietary AAV1 construct Nonsurgical injection directly to cerebrospinal fluid (CSF) Durable, elevated CSF PGRN levels* Urgent Patient Need in FTD-GRN Differentiated, Potential Best-in-Class Profile Fast Track and Orphan Drug Designation * Based on interim data.

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5 Significant Market Opportunity for PBFT02 Across Multiple Neurodegenerative Diseases ~18,000 ~21,000 ~72,600 ~3.9M FTD-GRN1–3 FTD-C9orf722–4 AMYOTROPHIC LATERAL SCLEROSIS (ALS) 5–6 ALZHEIMER’S DISEASE (GRN SNP)*7–8 * rs5848 single nucleotide polymorphism (SNP) 1. Greaves CV, et al. J Neurol 2019; 266:2075-2086. 2. Galvin JE, et al. Neurology 2017; 89:2049-2056. 3. Onyike CU, et al. Int Rev Psychiatry 2013; 25:130-137. 4. Moore KM, et al. Lancet Neurol 2020; 19: 145–156. 5. Brown et al. Neuroepi 2021; 55:342-353. 6. CDC ALS Registry Dashboard. 7. Sheng J, et al. Gene 2014; 141-145. 8. Alz Assoc. 2023 Alzheimer’s Disease Facts and Figures. Alzheimers Dement 2023;19. Estimated Prevalence (US and EU)

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6 Anticipated Upcoming Milestones and Data Readouts 2H 2024 1H 2025 2H 2025 Obtain regulatory feedback on the pathway to treating ALS patients Report 12-month Cohort 1 and interim Cohort 2 data FTD-GRN Milestones FTD-C9orf72 and ALS Milestones Initiate dosing of FTD-C9orf72 patients Seek regulatory feedback on pivotal trial design

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PBFT02 Frontotemporal Dementia-GRN

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8 FTD: A Devastating Adult Disease OVERVIEW • Fatal adult-onset neurodegenerative disease affecting the frontal and temporal lobes of the brain, characterized by a decline in behavior, language and executive function • One of the most common causes of early-onset dementia worldwide, disproportionately affecting individuals aged 40-65 years CLINICAL SYMPTOMS Disease progression is rapid and degenerative, including loss of speech, loss of expression, behavioral changes and immobility On average, people with FTD live 8 years after the onset of symptoms

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9 Progranulin Deficiency is the Defining Characteristic of FTD-GRN and Leads to Neurodegeneration Progranulin is critical to maintaining CNS cell homeostasis Rhinn H et al. Trends Pharm Sci. 2022, 43:641-652.

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10 Elevated PGRN Increases Potential for Improved Cellular Function • Progranulin is a secreted protein that binds to cell membrane receptors to affect multiple intracellular pathways –Major role is regulating intracellular lysosomal activity –Extracellular PGRN is endocytosed via multiple receptors • Driving elevated PGRN levels in the extracellular space increases the amount of PGRN available to enter target CNS cells • Able to leverage cross-correction mechanism: secreted PGRN can be taken up by non-transduced cells Paushter et al., Acta Neuropathol. 2018;136(1):1-17., Rhinn et al., Trends in Pharmacological Sciences 2022; 43.8:641-652.

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11 Preclinical: AAV1 Achieved the Highest Levels of CSF PGRN in NHPs AAV1 increased CSF PGRN levels ~5x more than AAV5 and AAVhu68 (proprietary AAV9 variant) vectors, without further elevating peripheral levels Production of Human PGRN in Plasma AAV1 transgene delivery led to highest hPGRN levels in CSF CSF PGRN (ng/mL) 0 10 20 30 40 CSF 0.1 1 10 100 LLOQ Normal Day RA2981 RA2982 RA3027 RA3153 RA3151 RA3170 RA3155 RA3160 AAVhu68 AAVhu68 (v2) AAV1 AAV5 RA2981 RA2982 RA3027 RA3153 RA3151 RA3170 RA3155 RA3160 AAVhu68 AAVhu68 (v2) AAV1 AAV5 RA2981 RA2982 RA3027 RA3153 RA3151 RA3170 RA3155 RA3160 AAVhu68 AAVhu68 (v2) AAV1 AAVhu68 AAV5 AAVhu68 (v2) AAV5 AAV1 Normal LLOQ Plasma Plasma PGRN (ng/mL) 0 10 20 30 40 0.1 1 10 100 Normal Day 1,000 Left, right: Two adult rhesus macaques per treatment received ICM AAV.hPGRN High dose, 3.0 x 1013 GC / 3.3 x 1011 GC/g brain) on study day 01 .. Shading: Reference range for healthy adult controls’ PGRN levels in CSF (n = 61) and plasma (n = 56) (Passage Bio data).

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12 Preclinical: ICM Administration of PBFT02 to NHPs Led to Broad Distribution of Vector Throughout Brain/Spinal Cord PBFT02 distribution after ICM administration to NHPs FCX PCX TCX OCX Hip Med CBL Cerv Thor Lum Cerv Thor Lum TRG Brain Spinal Cord DRG PBFT02 • Vector distributed to all sampled areas of brain and spinal cord • 3.0 x 1012 GC NHP dose equivalent to clinical Dose 1 of PBFT02 in upliFT-D study

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13 Preclinical: Higher CSF PGRN May Confer Reduction in Inflammatory Response • Microgliosis: inflammatory response to pathogenic insults in the CNS • CD68: marker of activated microglia Thalamus data shown above. Thalamic atrophy is a key feature commonly found in FTD PBFT02 reduced lipofuscin at all doses, suggesting correction of underlying mechanism of disease • Lipofuscin: increased levels associated with lysosomal dysfunction • Correlated with underlying mechanism of FTD-GRN Microgliosis reduction strongest at highest PBFT02 dose / PGRN level Murine FTD Model Murine FTD Model *p < 0.05, **p < 0.01, ***p < 0.001, ****p < 0.0001, one-way ANOVA followed by Tukey’s multiple comparisons test

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14 upliFT-D: Global Phase 1/2 Trial with PBFT02 DURATION 2 years; with additional 3 years of follow-up for safety and durability of effect PRIMARY ENDPOINTS Safety and tolerability SECONDARY ENDPOINTS Biomarkers • Progranulin (CSF, plasma) • GFAP (CSF, plasma) • vMRI • Retinal nerve fiber layer and retinal lipofuscin deposits via OCT • NfL (CSF, plasma) Clinical • CDR + NACC FTLD sum of boxes EXPLORATORY BIOMARKERS • Cathepsin D (CSF) • LAMP 1 (CSF) • Lys-GL1 (CSF) COHORT 1 Dose 1 (3.3e10 GC/g)* COHORT 2 Dose 2 (1.1e11 GC/g)* OPTIONAL COHORT 3 Optional dose 3 Recruiting IDMC review Phase 1/2 Multicenter Open-label Dose escalation study Up to 15 patients across 3 cohorts 1/2 TRIAL DESIGN COHORT 1 (n=5) Dose 1 COHORT 2 (n=3-5) Dose 1 OPTIONAL COHORT 3 IDMC review Phase Multicenter Open-label Dose escalation study Up to 15 patients across 3 cohorts 1/2 Complete Dose 1: 3.3e10 GC/g estimated brain weight.

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15 Intra-Cisterna Magna (ICM) Administration • Directly deliver vector into the CSF via a single injection to reach both CNS and peripheral tissues1 –Allows for broad CNS biodistribution –Lower doses compared to IV systemic delivery –Reduced impact of neutralizing antibodies • Brief (<60 min), non-surgical, CT-guided procedure to allow for precise delivery to the cisterna magna –Infusion catheter does not enter brain tissues Cisterna magna 1. Hinderer et. al, Human Gene Therapy. 2018 Jan; 29(1):15-24​.

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16 upliFT-D: Interim Data from Cohort 1 Patients • PBFT02 was well-tolerated among the four patients (P2-5) who received revised immunosuppression regimen –Among these patients, there were no SAEs; only mild-to-moderate treatment emergent AEs were reported • No evidence of DRG toxicity, as measured by nerve conduction studies • No complications during ICM administration observed Safety* Efficacy / Target Engagement • Interim data demonstrates PBFT02 potential for best-in-class efficacy at Dose 1 • Relative to baseline, PBFT02 increased CSF PGRN expression in all patients consistently; up to 6-fold at Day 30 (n=5) and up to 10-fold at Day 180 (n=2) • CSF PGRN levels remained elevated at Day 360 (n=1) SAE: serious adverse event; AE: adverse event; DRG: dorsal root ganglion; ICM: intracisterna magna *Patient safety follow-up ranged from 2 to 12 months post-dosing as of data cutoff of August 20, 2024

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17 • Potential best-in-class PGRN profile at Dose 1 • Continued elevation of CSF PGRN at 6-months (n=2) and 12-months (n=1) –Patient 2 rate of increase slowed between Day 180 and 360 (D30-180: 58% vs. D180-360: 26%) • Consistent response across all treated patients Initial Patients Treated with PBFT02 Have Seen a Substantial Increase in CSF PGRN Dosing D30 D60 D180 D360 Patient 1 1.9 12.7 N/A N/A N/A Patient 2 2.8 17.3 N/A 27.3 34.2 Patient 3 2.9 10.7 13.7 21.7 Patient 4 2.2 12.3 N/A Patient 5 2.3 13.6 N/A CSF Progranulin (ng/mL) Shading: Reference range for healthy adult controls’ PGRN levels in CSF (range: 3.28 – 8.15 ng/mL, mean: 4.76 ng/mL, n = 61) (Passage Bio data) CSF=Cerebrospinal fluid 0 3 6 9 12 15 18 21 24 27 30 33 36 0 30 60 180 360 CSF PGRN, ng/mL Time (days) Dose 1 Progranulin, CSF Patient 1 Patient 2 Patient 3 Patient 4 Patient 5

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18 • Plasma PGRN levels remained below normal levels at up to 12 months post-dose • PGRN increased only in the CSF, where it has potential to correct neurodegeneration Plasma PGRN Levels Remained Below Normal Levels Post-Dose Shading: Lower limit of normal reference range for healthy adult controls’ PGRN levels in plasma (91.6 – 372.4 ng/mL, n = 56) (Passage Bio data) 0 10 20 30 40 50 60 70 80 90 100 0 7 14 30 60 90 180 360 Plasma PGRN, ng/mL Time (days) Dose 1 Progranulin, Plasma Patient 1 Patient 2 Patient 3 Patient 4 Patient 5

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19 Summary SAFETY1 PBFT02 Dose 1 generally well-tolerated to date among the four Cohort 1 patients who received revised steroid regimen following protocol amendment • No serious AEs • All AEs mild to moderate in intensity • No evidence of clinically significant immune response, hepatotoxicity or venous sinus thrombosis • No evidence of DRG toxicity • No complications during ICM administration observed BIOMARKERS • Potential best-in-class PGRN profile at Dose 1 • Continued elevation of CSF PGRN at 6-months (n=2) and 12-months (n=1) • Consistent response across Cohort 1 patients (n=5) •No increase in plasma PGRN levels up to 12-months ANTICIPATED NEXT STEPS • Report 12-month Cohort 1 and interim Cohort 2 data in 1H 2025 • Seek regulatory feedback on pivotal trial design in 2H 2025 AEs=adverse events; ICM=intra-cisterna magna; DRG=dorsal root ganglia 1. Patient safety follow-up ranged from 2 to 12 months post-dosing as of data cutoff of August 20, 2024

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Looking Ahead

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21 PBFT02 has Potential to Correct Underlying Pathology in FTD-GRN, FTD-C9orf72 and ALS TDP-43 pathology is a hallmark of multiple neurodegenerative diseases1 • TDP-43 mislocalizes from nucleus to cytoplasm • Forms inclusion bodies associated with neurodegeneration 1. Rhinn H et al. Trends Pharm Sci. 2022, 43:641-652

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22 TDP-43 pathology due to lysosomal dysfunction (GRN/ TMEM106 double knockout, DKO) reduced by AAV.hPGRN1 Elevated PGRN Ameliorates TDP-43 Pathology in Preclinical Models AAV delivered hPGRN to DKO mouse brain TDP-43 pathology in DKO mice reduced by AAV.hPGRN Elevated PGRN reduced insoluble TDP-43 in mouse spinal cord Elevated PGRN extended survival of TDP-43 mutant mice Elevated PGRN ameliorated TDP-43 pathology and disease course in a preclinical model2 • Elevated PGRN also prevented degeneration of large axon fibers in TDP-43 mice • PGRN neuroprotection from pleiotropic effect, not single pathway 1. Reich et al. (2023) bioRxiv preprint 07.14.549089; 2. Beel et al (2018) Mol Neurodegen; Laird et al. (2010) Plos One. DKO=double gene knockout; GRN=granulin gene; PGRN=progranulin; TDP-43=transactive response DNA binding protein 43 kDa. † PGRN increased to >2x endogenous levels

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23 GRN rs5848 SNP associated with accelerated disease in FTD-C9orf72 patients Decreased PGRN Associated with Greater Disease Severity in Multiple CNS Conditions GRN rs5848 SNP associated with accelerated disease in FTD-C9orf72 patients 1. van Blitterswijk et al (2014) Mol Neurodegen. AD=Alzheimer’s disease; ALS=amyotrophic lateral sclerosis; GRN=granulin gene; PGRN=progranulin; SNP=single nucleotide polymorphism. PGRN SNPs are genetic risk factors for CNS diseases • GRN rs5848 SNP results in ~15% reduction in PGRN levels • PGRN SNPs increase risk for, and worsen severity of, FTD/ALS-C9orf72 and AD1

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24 • GRN SNP rs5848 carriers have reduced PGRN levels and increased risk for AD • AD patients with GRN SNP rs5848 show reduced PGRN levels and increased CSF tau • GRN SNP rs5848 is estimated to occur in 30% of the general population, with a similar prevalence rate among AD patients2 • PGRN ablation exacerbates AD pathology in mice • PGRN overexpression reduces pathology burden in AD models Genetic Risk1 Prevalence Supporting Preclinical Evidence3 PBFT02 has Potential to Modulate Alzheimer’s Disease SNP=single nucleotide polymorphism. Third-party preclinical data. Sources: 1. Chen Y et al. J Neurol. 2015, 262:814-22; Takahashi H et al. Acta Neuropathol. 2017, 133:785-807. 2. Fenoglio C et al. J Alzheimers Dis. 2009, 18:603-612 (allele frequency used to estimate prevalence among AD patients). 3. Hosokawa M et al. J Neuropath Exp Neurol. 2015, 74:158-65; Minami SS et al. Nat Med. 2014, 20:1157-64; Van Kampen JM & Kay DG. PLoS ONE 2017, 12:e0182896.

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25 Leading In-House CMC Capabilities to Support PBFT02 Development Proven analytical development capabilities In-House CMC Analytical Capabilities to Support Program Advancement and Future Commercialization of PBFT02 Integrated process development GMP QC capabilities Strong regulatory CMC scientific expertise Scale-up capability

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26 Upcoming Milestones and Corporate Updates PIPELINE • Advancing Huntington’s disease preclinical program • Licensed pediatric clinical-stage programs (GM1, Krabbe and MLD) to GEMMA Biotherapeutics BALANCE SHEET • Cash balance of $92 million as of 6/30/24* • Cash runway to the end of 2Q 2026* * Based on cash, cash equivalents and marketable securities and initial proceeds from out-licensing of pediatric programs. TIMING MILESTONE FTD-GRN 1H 2025 Report 12-month Cohort 1 and interim Cohort 2 data 2H 2025 Seek regulatory feedback on pivotal trial design PBFT02 Additional Indications 2H 2024 Obtain regulatory feedback on clinical pathway for treating ALS patients 1H 2025 Initiate dosing of FTD-C9orf72 patients

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27 REDEFINING THE COURSE OF NEURODEGENERATIVE CONDITIONS Advancing potential best-in-class, one-time progranulin raising FTD-GRN gene therapy In-house manufacturing process development to support program execution Strong cash position with runway expected to the end of 2Q 2026* Exploring benefits of elevated progranulin in multiple adult neurodegenerative diseases * Based on cash, cash equivalents and marketable securities as of June 30, 2024 and initial proceeds from out-licensing of pediatric programs.

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Thank You passagebio.com | NASDAQ: PASG

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29 Focused Pipeline Addressing Rare and Prevalent Neurodegenerative Indications Program Indication US/EU prevalence Discovery Preclinical Phase 1/2 Pivotal PBFT02 Frontotemporal dementia - GRN 18,0001-3 Frontotemporal dementia - C9orf72 21,0002-4 Amyotrophic lateral sclerosis 72,6005-6 Alzheimer’s disease with rs5848 SNP 3.9M7-8 Unnamed Huntington’s disease 60,0009 PBGM01 GM1 gangliosidosis PBKR03 Krabbe disease PBML04 Metachromatic leukodystrophy Licensed to GEMMA Biotherapeutics 1. Greaves CV, et al. J Neurol 2019; 266:2075-2086. 2. Galvin JE, et al. Neurology 2017; 89:2049-2056. 3. Onyike CU, et al. Int Rev Psychiatry 2013; 25:130-137. 4. Moore KM, et al. Lancet Neurol 2020; 19: 145–156. 5. Brown et al. Neuroepi 2021; 55:342-353. 6. CDC ALS Registry Dashboard. 7. Sheng J, et al. Gene 2014; 141-145. 8. Alz Assoc. 2023 Alzheimer’s Disease Facts and Figures. Alzheimers Dement 2023;19. 9. Crowell et al. Neuroepi. 2021; 55:361-368

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30 Demonstrated Leadership LEADERSHIP TEAM Deep experience in rare disease, CNS disorders and genetic medicines Eden Fucci SVP Technical Operations BOARD OF DIRECTORS Maxine Gowen, Ph.D. Chairwoman Athena Countouriotis, M.D. Avenzo Therapeutics Derrell Porter, M.D. cTRL Therapeutics Dolan Sondhi, Ph.D. Weill Cornell Medicine Sandip Kapadia Harmony Biosciences Saqib Islam, J.D. SpringWorks Thomas Kassberg Ultragenyx William Chou, M.D. President & Chief Executive Officer Stuart Henderson Chief Business Officer William Chou, M.D. President & Chief Executive Officer Chip Cale General Counsel & Corporate Secretary Kathleen Borthwick Chief Financial Officer Karl Whitney SVP Global Regulatory Affairs Sue Browne, Ph.D. Chief Scientific Officer

Exhibit 99.3

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Day 13 Unsch. Day 16 Day 30 Day 42 Unsch. Day 53 Unsch. Day 55 Unsch. Day 64 Unsch. Day 71 Unsch. Day 78 Day 90 Day 120 Day 180 Day 240 Day 300 Day 360 ALT (U/L) ALT (U/L) 0 10 20 30 40 50 60 70 80 90 100 Screening Day 1 Dosing Day 7 Unsch. Day 13 Unsch. Day 16 Day 30 Day 42 Unsch. Day 53 Unsch. Day 64 Unsch. Day 78 Day 90 Day 120 Day 180 Day 240 Day 300 Day 360 AST (U/L) AST (U/L) Participant 2 Participant 3 Participant 4 Participant 5 Participant 2 Participant 3 Participant 4 Participant 5 PBFT02 PBFT02 ITR ITR CB7 promoter Chimeric intron Codon ŽƉƟŵŝnjĞĚ​ŚGRN PolyA &ŝŐƵƌĞ​ϭ​ʹ​​W&dϬϮ​ǀĞĐƚŽƌ​ƐƚƌƵĐƚƵƌĞ &ŝŐƵƌĞ​ϰ​W'ZE​ůĞǀĞůƐ​ŝŶ​&​ĨŽůůŽǁŝŶŐ​W&dϬϮ​ ĂĚŵŝŶŝƐƚƌĂƟŽŶ DĞĚŝĐĂů​ǁƌŝƟŶŐ​ƐƵƉƉŽƌƚ​ǁĂƐ​ƉƌŽǀŝĚĞĚ​ďLJ​ WĂƌĞdžĞů​/ŶƚĞƌŶĂƟŽŶĂů​ĂŶĚ​ĨƵŶĚĞĚ​ďLJ​WĂƐƐĂŐĞ​ŝŽ͕​/ŶĐ​ • ƚƵĚŝĞƐ​ŝŶ​ŶŽŶͲŚƵŵĂŶ​ƉƌŝŵĂƚĞƐ​ŚĂǀĞ​ ĚĞŵŽŶƐƚƌĂƚĞĚ​ǁŝĚĞƐƉƌĞĂĚ​ĚŝƐƚƌŝďƵƟŽŶ​ŽĨ​ W&dϬϮ​ƚŚƌŽƵŐŚŽƵƚ​ƚŚĞ​ďƌĂŝŶ​ǁŚĞŶ​ĂĚŵŝŶŝƐƚĞƌĞĚ​ ŝŶƚƌĂƚŚĞĐĂůůLJ​ŝŶ​ƚŚĞ​ĐŝƐƚĞƌŶĂ​ŵĂŐŶĂϭ • /Ŷ​ŵƵƌŝŶĞ​ŵŽĚĞůƐ​ŽĨ​&d͕​ĂĚŵŝŶŝƐƚƌĂƟŽŶ​ŽĨ​ W&dϬϮ​ƌĞƐƚŽƌĞƐ​ůLJƐŽƐŽŵĂů​ĨƵŶĐƟŽŶ​ĂŶĚ​ƌĞĚƵĐĞƐ​ ŶĞƵƌŽĚĞŐĞŶĞƌĂƟŽŶϭ • W&dϬϮ​ŝƐ​ďĞŝŶŐ​ĚĞǀĞůŽƉĞĚ​ĂƐ​Ă​ĚŝƐĞĂƐĞͲŵŽĚŝĨLJŝŶŐ​ ƚŚĞƌĂƉLJ​ĨŽƌ​ŝŶĚŝǀŝĚƵĂůƐ​ǁŝƚŚ​&dͲGRN and &dͲC9orf72 • ,ĞƌĞ​ǁĞ​ƉƌĞƐĞŶƚ​ŝŶƚĞƌŝŵ​ƐĂĨĞƚLJ​ĂŶĚ​ďŝŽŵĂƌŬĞƌ​ ĚĂƚĂ​ĨƌŽŵ​&dͲGRN​ƉĂƌƟĐŝƉĂŶƚƐ​ŝŶ​ƵƉůŝ&dͲ​ ŽŚŽƌƚ​ϭ Methods ƚƵĚLJ​ĚĞƐŝŐŶ • W&dϬϮ​ŝƐ​ďĞŝŶŐ​ĂƐƐĞƐƐĞĚ​ŝŶ​Ă​ƉŚĂƐĞ​ϭͬϮ​ ĐůŝŶŝĐĂů​ƚƌŝĂů​ŝŶ​ƉĂƌƟĐŝƉĂŶƚƐ​ǁŝƚŚ​&dͲGRN and &dͲC9orf72​;ƵƉůŝ&dͲ͖​EdϬϰϳϰϳϰϯϭͿ​;&ŝŐƵƌĞ​ϮͿ • dŚŝƐ​ŵƵůƟͲĐĞŶƚĞƌ͕​ŽƉĞŶͲůĂďĞů͕​ĮƌƐƚͲŝŶͲŚƵŵĂŶ​ƐƚƵĚLJ​ ǁĂƐ​ĚĞƐŝŐŶĞĚ​ƚŽ​ĞǀĂůƵĂƚĞ​ƐĂĨĞƚLJ͕​ƚŽůĞƌĂďŝůŝƚLJ͕​ĂŶĚ​ ƉŚĂƌŵĂĐŽĚLJŶĂŵŝĐƐ​ŽĨ​W&dϬϮ • ĚĚŝƟŽŶĂů​ĞŶĚƉŽŝŶƚƐ​ŝŶĐůƵĚĞ͕​ďŝŽŵĂƌŬĞƌƐ​ŽĨ​ ůLJƐŽƐŽŵĂů​ĚLJƐĨƵŶĐƟŽŶ​ĂŶĚ​ŶĞƵƌŽĚĞŐĞŶĞƌĂƟŽŶ͕​ ŝŵŵƵŶŽŐĞŶŝĐŝƚLJ͕​ĂŶĚ​ĐůŝŶŝĐĂů​ƐƚĂƚƵƐ • W&dϬϮ​ŝƐ​ĂĚŵŝŶŝƐƚĞƌĞĚ​ǀŝĂ​/D​ŝŶũĞĐƟŽŶ​ƵŶĚĞƌ​ d​ŐƵŝĚĂŶĐĞ &ŝŐƵƌĞ​Ϯ​ƵƉůŝ&dͲ​ƐƚƵĚLJ​ĚĞƐŝŐŶ FTD-GRN COHORT 2 Dose 1 (3.3e10 GC/g*) COHORT 3 ;KƉƟŽŶĂůͿ COHORT 4 COHORT 5 FTD-C9orf72 COHORT 1 Dose 1 (3.3e10 GC/g*) Completed IDMC review Ύ'ͬŐ͕​ŐĞŶĞ​ĐŽƉŝĞƐ​ƉĞƌ​ŐƌĂŵ​ŽĨ​ĞƐƟŵĂƚĞĚ​ďƌĂŝŶ​ǁĞŝŐŚƚ ĂƐŚĞĚ​ůŝŶĞƐ​ƌĞƉƌĞƐĞŶƚ​ŽďƐĞƌǀĞĚ​ƌĂŶŐĞ​ŽĨ​W'ZE​ůĞǀĞůƐ​ŝŶ​&​ĨƌŽŵ​ŚĞĂůƚŚLJ​ĂĚƵůƚƐ​ ;ϯ͘Ϯϴʹϴ͘ϭϱ​ŶŐͬŵ>͕​ŶсϲϭͿ ƚƵĚLJ​ƐƚĂƚƵƐ • &ŝǀĞ​ƉĂƌƟĐŝƉĂŶƚƐ​ǁĞƌĞ​ĞŶƌŽůůĞĚ​ŝŶ​ŽŚŽƌƚ​ϭ͖​ ĨŽƵƌ​ƉĂƌƟĐŝƉĂŶƚƐ​ƌĞŵĂŝŶ​ŝŶ​ƚŚĞ​ƐƚƵĚLJ​ĂƐ​ŽĨ​ ƵŐƵƐƚ​ϮϬ͕​ϮϬϮϰ​;ŵŽƐƚ​ƌĞĐĞŶƚ​ĚĂƚĂ​ĐƵƚͿ • KŶĞ​ƉĂƌƟĐŝƉĂŶƚ​ǁŝƚŚĚƌĞǁ​ĨƌŽŵ​ƚŚĞ​ƐƚƵĚLJ​ ϯ​ŵŽŶƚŚƐ​ƉŽƐƚͲW&dϬϮ​ĂĚŵŝŶŝƐƚƌĂƟŽŶ • ŽŚŽƌƚ​Ϯ​ŝƐ​ĐƵƌƌĞŶƚůLJ​ĞŶƌŽůůŝŶŐ • ŽŚŽƌƚ​ϰ​ŝƐ​ĂŶƟĐŝƉĂƚĞĚ​ƚŽ​ďĞ​ŽƉĞŶ​ĨŽƌ​ĞŶƌŽůůŵĞŶƚ​ ŝŶ​ƚŚĞ​ĮƌƐƚ​ŚĂůĨ​ŽĨ​ϮϬϮϱ ZĞĨĞƌĞŶĐĞ͗​ϭ͗​ĂƚĂ​ŽŶ​ĨŝůĞ /ŵŵƵŶŽŐĞŶŝĐŝƚLJ • EŽŶĞ​ŽĨ​ƚŚĞ​ƉĂƌƟĐŝƉĂŶƚƐ​ŝŶ​ŽŚŽƌƚ​ϭ​ŚĂĚ​ĂŶƟͲsϭ​ŶĞƵƚƌĂůŝnjŝŶŐ​ĂŶƟďŽĚŝĞƐ​Ăƚ​ďĂƐĞůŝŶĞ͖​ ĂƐ​ĞdžƉĞĐƚĞĚ͕​Ăůů​ƉĂƌƟĐŝƉĂŶƚƐ​ĚĞǀĞůŽƉĞĚ​ĂŶƟͲsϭ​ĂŶƟďŽĚŝĞƐ​ŝŶ​&​ĂŶĚ​ƐĞƌƵŵ​Ăƚ​ ϯϬ​ĚĂLJƐ​ƉŽƐƚͲW&dϬϮ​ƚƌĞĂƚŵĞŶƚ​ • dǁŽ​ƉĂƌƟĐŝƉĂŶƚƐ​ĚĞǀĞůŽƉĞĚ​dͲĐĞůů​ƌĞƐƉŽŶƐĞ​ĂŐĂŝŶƐƚ​sϭ​ϭϴϬ​ĚĂLJƐ​ƉŽƐƚͲW&dϬϮ​ ƚƌĞĂƚŵĞŶƚ͕​ǁŝƚŚ​ŶŽ​ĐůŝŶŝĐĂů​ƐŝŐŶŝĮĐĂŶĐĞ • EŽ​dͲ​Žƌ​ͲĐĞůů​ŝŵŵƵŶĞ​ƌĞƐƉŽŶƐĞ​ĂŐĂŝŶƐƚ​ŚW'ZE​ǁĂƐ​ĚĞƚĞĐƚĞĚ ​ƐŝŶŐůĞ​ĚŽƐĞ​ŽĨ​W&dϬϮ​ƉƌŽŵŽƚĞƐ​Ă​ƌŽďƵƐƚ​ĂŶĚ​ ĚƵƌĂďůĞ​ŝŶĐƌĞĂƐĞ​ŝŶ​W'ZE​ĞdžƉƌĞƐƐŝŽŶ • ZĞůĂƟǀĞ​ƚŽ​ďĂƐĞůŝŶĞ͕​W&dϬϮ​ŝŶĐƌĞĂƐĞĚ​&​W'ZE​ ĞdžƉƌĞƐƐŝŽŶ​ŝŶ​Ăůů​ƉĂƌƟĐŝƉĂŶƚƐ͖​ƵƉ​ƚŽ​ϲͲĨŽůĚ​Ăƚ​ĚĂLJ​ϯϬ​ ;ŶсϱͿ​ĂŶĚ​ƵƉ​ƚŽ​ϭϬͲĨŽůĚ​Ăƚ​ĚĂLJ​ϭϴϬ​;ŶсϮͿ͘​dŚĞ​ĞīĞĐƚ​ŽĨ​ W&dϬϮ​ǁĂƐ​ĐŽŶƐŝƐƚĞŶƚ​ĂĐƌŽƐƐ​Ăůů​ƉĂƌƟĐŝƉĂŶƚƐ​;&ŝŐƵƌĞ​ϰͿ • &​W'ZE​ůĞǀĞůƐ​ƌĞŵĂŝŶĞĚ​ĞůĞǀĂƚĞĚ​Ăƚ​ĚĂLJ​ϯϲϬ​;ŶсϭͿ͘​ dŚĞ​ƌĂƚĞ​ŽĨ​ŝŶĐƌĞĂƐĞ​ƐůŽǁĞĚ​ďĞƚǁĞĞŶ​ĚĂLJƐ​ϭϴϬ​ĂŶĚ​ϯϲϬ​ ;ϯϬͲϭϴϬ͗​ϱϴй​ǀƐ͘​ϭϴϬͲϯϲϬ͗​ϮϲйͿ • &ŽůůŽǁŝŶŐ​W&dϬϮ​ƚƌĞĂƚŵĞŶƚ͕​ƉůĂƐŵĂ​W'ZE​ĞdžƉƌĞƐƐŝŽŶ​ ƌĞŵĂŝŶĞĚ​ďĞůŽǁ​ƚŚĞ​ƌĂŶŐĞ​ŽďƐĞƌǀĞĚ​ŝŶ​ŚĞĂůƚŚLJ​ĂĚƵůƚƐ​ ĂŵŽŶŐ​Ăůů​ŽŚŽƌƚ​ϭ​ƉĂƌƟĐŝƉĂŶƚƐ​ &ŝŐƵƌĞ​ϯ ,ĞƉĂƚŽƚŽdžŝĐŝƚLJ​ŵĂƌŬĞƌƐ​ƉŽƐƚͲW&dϬϮ​ĂĚŵŝŶŝƐƚƌĂƟŽŶ​ŝŶ​ŽŚŽƌƚ​ϭ​ƉĂƌƟĐŝƉĂŶƚƐ​ ǁŚŽ​ƌĞĐĞŝǀĞĚ​Ă​ƌĞǀŝƐĞĚ​ŝŵŵƵŶŽƐƵƉƉƌĞƐƐŝŽŶ​ƌĞŐŝŵĞŶ​ ĂƐĞůŝŶĞ​ĚĞŵŽŐƌĂƉŚŝĐƐ​ĂŶĚ​ĐůŝŶŝĐĂů​ĐŚĂƌĂĐƚĞƌŝƐƟĐƐ • ĂƐĞůŝŶĞ​ĚĞŵŽŐƌĂƉŚŝĐƐ​ĂŶĚ​ĐůŝŶŝĐĂů​ĐŚĂƌĂĐƚĞƌŝƐƟĐƐ​ŽĨ​ŽŚŽƌƚ​ϭ​ƉĂƌƟĐŝƉĂŶƚƐ​ĂƌĞ​ƐŚŽǁŶ​ in Table 1 • ůů​ƉĂƌƟĐŝƉĂŶƚƐ​ŚĂĚ​Ă​ĐŽŶĮƌŵĞĚ​ƉĂƚŚŽŐĞŶŝĐ​GRN​ŵƵƚĂƟŽŶ​ĂŶĚ​ƐLJŵƉƚŽŵĂƟĐ​&dͲGRN ;Z͕​Ƶŵ​ŽĨ​ŽdžĞƐ​ƐĐŽƌĞƐ​ƌĂŶŐĞĚ​ďĞƚǁĞĞŶ​ϳ​ĂŶĚ​ϭϳͿ ĂLJ​ϭ ĂLJ​ϯϬ ĂLJ​ϲϬ​ ĂLJ​ϭϴϬ ĂLJ​ϯϲϬ Wϭ ϭ͘ϵ ϭϮ͘ϳ Eͬ Eͬ Eͬ WϮ Ϯ͘ϴ ϭϳ͘ϯ Eͬ Ϯϳ͘ϯ ϯϰ͘Ϭ Wϯ Ϯ͘ϵ ϭϬ͘ϳ ϭϯ͘ϳ Ϯϭ͘ϳ Eͬ Wϰ Ϯ͘Ϯ ϭϮ͘ϯ Eͬ Eͬ Eͬ Wϱ Ϯ͘ϯ ϭϯ͘ϲ Eͬ Eͬ Eͬ Table 2 ĚǀĞƌƐĞ​ĞǀĞŶƚƐ​ƌĞƉŽƌƚĞĚ​ĂŵŽŶŐ​ŽŚŽƌƚ​ϭ​ƉĂƌƟĐŝƉĂŶƚƐ ŽŚŽƌƚ​ϭ​;EсϱͿ͕​Ŷ​;йͿ​΀ĞǀĞŶƚƐ΁ ŶLJ​ƚƌĞĂƚŵĞŶƚͲƌĞůĂƚĞĚ​d ϱ​;ϭϬϬ͘ϬͿ​΀ϰϬ΁ DŝůĚ​;'ƌĂĚĞ​ϭͿ ϱ​;ϭϬϬ͘ϬͿ​΀Ϯϵ΁ DŽĚĞƌĂƚĞ​;'ƌĂĚĞ​ϮͿ ϰ​;ϴϬ͘ϬͿ​΀ϵ΁ ĞǀĞƌĞ​;'ƌĂĚĞ​ϯͿ ϭ​;ϮϬ͘ϬͿ΀Ϯ΁ >ŝĨĞ​ƚŚƌĞĂƚĞŶŝŶŐ​;'ƌĂĚĞ​ϰͿ Ϭ​ ĞĂƚŚ​;'ƌĂĚĞ​ϱͿ Ϭ ŶLJ​ ϭ​;ϮϬ͘ϬͿ​΀Ϯ΁ ŶLJ​ƚƌĞĂƚŵĞŶƚͲƌĞůĂƚĞĚ​ ϭ​;ϮϬ͘ϬͿ​΀Ϯ΁ ŶLJ​d​ůĞĂĚŝŶŐ​ƚŽ​ĞĂƌůLJ​ĚŝƐĐŽŶƟŶƵĂƟŽŶ ϭ​;ϮϬ͘ϬͿ DŽƐƚ​ĐŽŵŵŽŶ​d​ďLJ​K​ĂŵŽŶŐ​ŽŚŽƌƚ​ϭ​ƉĂƌƟĐŝƉĂŶƚƐ​ǁĂƐ​ŶĞƌǀŽƵƐ​ƐLJƐƚĞŵ​ĚŝƐŽƌĚĞƌƐ​;Ŷсϰ͖​ϴϬ͘ϬйͿ͘​Ɛ​ŝŶĐůƵĚĞĚ​ŚĞƉĂƚŽƚŽdžŝĐŝƚLJ​ ĂŶĚ​ĐĞƌĞďƌĂů​ǀĞŶŽƵƐ​ƐŝŶƵƐ​ƚŚƌŽŵďŽƐŝƐ​;ĂƐLJŵƉƚŽŵĂƟĐ​ĂŶĚ​ĚĞƚĞĐƚĞĚ​ŽŶ​ĂŶ​ƵŶƐĐŚĞĚƵůĞĚ​DZ/​ƐĐĂŶ​ϱϱ​ĚĂLJƐ​ƉŽƐƚͲƚƌĞĂƚŵĞŶƚͿ͖​ďŽƚŚ​ǁĞƌĞ​ ĐŽŶƐŝĚĞƌĞĚ​ƚƌĞĂƚŵĞŶƚͲ​Žƌ​ƉƌŽĐĞĚƵƌĞͲƌĞůĂƚĞĚ Table 1 ĂƐĞůŝŶĞ​ĚĞŵŽŐƌĂƉŚŝĐƐ​ĂŶĚ​ĐůŝŶŝĐĂů​ĐŚĂƌĂĐƚĞƌŝƐƟĐƐ​ŽĨ​ŽŚŽƌƚ​ϭ​ƉĂƌƟĐŝƉĂŶƚƐ P1 P2 Wϯ Wϰ P5 ŐĞ​;LJĞĂƌƐͿ ϱϭ ϱϵ ϲϬ ϲϵ ϳϭ 'ĞŶĚĞƌ Male &ĞŵĂůĞ Male Male &ĞŵĂůĞ &dͲGRN​ƉŚĞŶŽƚLJƉĞ ůǀWW ďǀ&d ďǀ&d ƐǀWW ďǀ&d ŐĞ​Ăƚ​ĚŝĂŐŶŽƐŝƐ​;ĚŝƐĞĂƐĞ​ĚƵƌĂƟŽŶ͕​LJĞĂƌƐͿ ϰϳ​;ϰͿ ϱϲ​;ϯͿ ϱϵ​;ϭͿ ϲϴ​;ϭͿ ϲϳ​;ϰͿ W'ZE​Ăƚ​ƐĐƌĞĞŶŝŶŐ͕​ƉůĂƐŵĂ​;ŶŐͬŵ>Ϳ ϲϬ͘ϵ ϰϰ͘ϴ ϯϲ͘Ϭ Ϯϱ͘ϱ ϭϳ͘ϰ W'ZE​Ăƚ​ďĂƐĞůŝŶĞ͕​&​;ŶŐͬŵ>Ϳ ϭ͘ϵ Ϯ͘ϴ Ϯ͘ϵ Ϯ͘Ϯ Ϯ͘ϯ ůŝŶŝĐĂů​ĞŵĞŶƟĂ​ZĂƟŶŐ​ĐĂůĞ͕​'ůŽďĂů ϭ Ϯ Ϯ Ϯ ϭ ůŝŶŝĐĂů​ĞŵĞŶƟĂ​ZĂƟŶŐ​ĐĂůĞ͕​Ƶŵ​ŽĨ​ŽdžĞƐ ϳ͘ϱ ϭϳ ϭϮ ϭϭ ϳ ůŝŶŝĐĂů​ĞŵĞŶƟĂ​ZĂƟŶŐ​ĐĂůĞ͕​Ƶŵ​ŽĨ​ŽdžĞƐ​ŚĂƐ​Ă​ƚŽƚĂů​ƐĐŽƌĞ​ŽĨ​Ϯϰ͖​ŚŝŐŚĞƌ​ƐĐŽƌĞƐ​ĂƌĞ​ŝŶĚŝĐĂƟǀĞ​ŽĨ​ŵŽƌĞ​ƐĞǀĞƌĞ​ĚĞŵĞŶƟĂ​ƉŚĞŶŽƚLJƉĞƐ Poster No. 007 ŽƉŝĞƐ​ŽĨ​ƚŚŝƐ​ƉŽƐƚĞƌ​ƉƌĞƐĞŶƚĂƚŝŽŶ​ŽďƚĂŝŶĞĚ​ƚŚƌŽƵŐŚ​YƵŝĐŬ​ZĞƐƉŽŶƐĞ​ ;YZͿ​ŽĚĞ​ĂƌĞ​ĨŽƌ​ƉĞƌƐŽŶĂů​ƵƐĞ​ŽŶůLJ​ĂŶĚ​ŵĂLJ​ŶŽƚ​ďĞ​ƌĞƉƌŽĚƵĐĞĚ​ ǁŝƚŚŽƵƚ​ƉĞƌŵŝƐƐŝŽŶ​ŽĨ​WĂƐƐĂŐĞ​ŝŽ͕​/ŶĐ͘ ŚƚƚƉƐ͗ͬͬďŝƚ͘ůLJͬϯyŬsďϴŚ

v3.24.3
Document and Entity Information
Sep. 16, 2024
Document and Entity Information [Abstract]  
Document Type 8-K
Document Period End Date Sep. 16, 2024
Entity File Number 001-39231
Entity Registrant Name PASSAGE BIO, INC.
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 82-2729751
Entity Address, Address Line One One Commerce Square
Entity Address, Adress Line Two 2005 Market Street, 39th Floor
Entity Address, City or Town Philadelphia
Entity Address, State or Province PA
Entity Address, Postal Zip Code 19103
City Area Code 267
Local Phone Number 866-0311
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, $0.0001 Par Value Per Share
Trading Symbol PASG
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity Central Index Key 0001787297
Amendment Flag false

Passage Bio (NASDAQ:PASG)
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